EP3556441A1 - Brandunterdrückende schaumbildende zusammensetzungen, vorläufer, deren verwendungen und verfahren zur herstellung davon - Google Patents

Brandunterdrückende schaumbildende zusammensetzungen, vorläufer, deren verwendungen und verfahren zur herstellung davon Download PDF

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EP3556441A1
EP3556441A1 EP18305472.5A EP18305472A EP3556441A1 EP 3556441 A1 EP3556441 A1 EP 3556441A1 EP 18305472 A EP18305472 A EP 18305472A EP 3556441 A1 EP3556441 A1 EP 3556441A1
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Prior art keywords
talc
surfactant
aqueous composition
water
composition according
Prior art date
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EP18305472.5A
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English (en)
French (fr)
Inventor
Michael Greenhill-Hooper
Adrien Borras
Gilles COLLARD
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Imertech SAS
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Imertech SAS
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Application filed by Imertech SAS filed Critical Imertech SAS
Priority to EP18305472.5A priority Critical patent/EP3556441A1/de
Priority to CN201980026229.3A priority patent/CN111989139A/zh
Priority to BR112020021041-2A priority patent/BR112020021041A2/pt
Priority to PCT/EP2019/060016 priority patent/WO2019202045A1/en
Priority to KR1020207032786A priority patent/KR20200141503A/ko
Priority to US17/048,265 priority patent/US20210101040A1/en
Priority to EP19719472.3A priority patent/EP3781271A1/de
Priority to JP2020556948A priority patent/JP2021520941A/ja
Publication of EP3556441A1 publication Critical patent/EP3556441A1/de
Withdrawn legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
    • A62D1/0071—Foams
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C99/00—Subject matter not provided for in other groups of this subclass
    • A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
    • A62C99/0036—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using foam
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
    • A62D1/0028—Liquid extinguishing substances
    • A62D1/0035—Aqueous solutions
    • A62D1/0042—"Wet" water, i.e. containing surfactant
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
    • A62D1/0071—Foams
    • A62D1/0085—Foams containing perfluoroalkyl-terminated surfactant

Definitions

  • the present invention relates to both aqueous and dry compositions for forming foams suitable as fire extinguishing compositions and to fire extinguishing foams.
  • the invention further relates to the use of particulate inorganic materials in the formation of foams, methods for improving foam stability, and methods of improving fire extinguishing properties of foams.
  • Aqueous foams are used to tackle so-called class B (liquid fuel) fires.
  • the foams are particularly used in external environments when dealing with large scale fires and fire risks. Examples of use are for the suppression and prevention of aircraft and marine vessel fires, civil aviation facilities such as airports and at industrial installations where large volumes of potentially flammable liquids are used or stored, e.g. petrochemical refineries, oil and gas rigs and platforms.
  • Other fire extinguishing media, applied in canisters are more commonly employed against smaller scale class B fire risks.
  • the preferred type of foam for this application are the so-called aqueous film forming foams (AFFF).
  • AFFF aqueous film forming foams
  • FC fluorocarbon
  • FC surfactants have come under scrutiny as they tend to persist in the environment and can be toxic to aquatic life.
  • C 8 chain-length FC surfactants are particularly harmful and have now either been banned by the relevant authorities or are subject to a self-imposed industry ban. By reducing the chain length from C 8 to C 6 , they are less harmful, but there is still concern and it is likely that eventually the use of all FC surfactants in this application will be outlawed.
  • US 2016/0023032 A1 discloses fire fighting compositions which comprise a combination of a high molecular weight water soluble anionic acrylic polymer, a polysaccharide gum and a surfactant, and which may achieve satisfactory fire extinguishing properties while at the same time having acceptable viscosity and storage stability.
  • these fire fighting compositions are limited to very specific high molecular weight polymers in combination with specific gums.
  • WO 2017/161162 A1 discloses fluorine free fire extinguishing foams which comprise novel organosiloxane compounds which are intended to improve spreading and film formation of the foams. While the novel organosiloxane compounds may be easier to synthesise than previous organosilicon containing compounds, these compounds are not currently available on the market and separate production and distribution channels are required.
  • US 2017/0368395 A1 discloses fluorine free fire extinguishing foams which comprise a combination of two different surfactants employed at specific weight ratios.
  • the foams disclosed therein achieve good spreading coefficients and fire extinguishing on small scale aviation fuel fires.
  • foam stabilisers the foam stability is expected to be low.
  • the present invention is embodied by an aqueous composition for suppressing fires, the composition comprising a surfactant and/or a hydrotrope, and a particulate inorganic material, selected from the group consisting of perlite, talc, calcium carbonate, kaoline, dolomite, and bentonite, and combinations thereof.
  • the aqueous composition according to the present invention may further comprise one or more additives.
  • aqueous foam forming compositions are provided which do not require the use of fluorinated compounds and which have good fire-fighting properties, in particular for class B fires.
  • the surfactant comprised in the aqueous composition of the present invention may be selected from the group of cationic surfactants, non-ionic surfactants and anionic surfactants.
  • the surfactant may be a cationic surfactant, such as for example an alkyl trimethyl ammonium halide such as tetradecyl trimethyl ammonium bromide or dicocodimethylammonium chloride, or dihydrogenated tallowoylethyl hydroxyethylammonium methosulfate, or a polymeric quaternary ammonium ester.
  • the surfactant may be an anionic surfactant selected from alkyl ether sulphates, such as sodium lauryl ether sulphate, and alkyl sulphates, such as sodium lauryl sulphate. It was found that these types of surfactants were particularly useful in the present invention.
  • the particulate inorganic material may be selected from the group consisting of talc, calcium carbonate, and kaolin.
  • the particulate inorganic material may be talc, such as for example microcrystalline talc, macrocrystalline talc, or a mixture thereof. It was found that these particulate inorganic materials offered particularly good performance.
  • the particulate inorganic material may be a synthetic talc.
  • the microcrystalline talc may have a d 50 of 10 ⁇ m or lower, such as 5 ⁇ m or lower, such as ranging from 0.01 to 3.0 ⁇ m, such as about 0.01 ⁇ m, or about 1.0 ⁇ m, or about 2.0 ⁇ m.
  • various particle size distributions may be selected.
  • the ratio of surfactant to water is in the range of 0.01 to 5 wt.- %. It was found that within this range, best results were obtained regarding fire extinguishing properties, storage properties, as well as environmental sustainability.
  • the ratio of particulate inorganic powder to surfactant is in the range of from 500:1 to 1:1.
  • the aqueous composition may be provided as a ready for use composition, or as a concentrate, which at the time of use in fire extinguishing application requires dilution using readily available local water sources, including salt water, sea water, and fresh water sources.
  • dry precursor compositions comprising a surfactant and/or a hydrotrope, and a particulate inorganic material, selected from the group consisting of perlite, talc, calcium carbonate, dolomite, and bentonite, and combinations thereof, and optionally one or more additives. It was found that such precursor compositions were, on the one hand, easy to handle and store, while on the other hand, after addition of water to obtain an aqueous composition in accordance with the present invention, they gave particularly stable and durable foams for use in fire extinguishing applications.
  • the dry precursor composition in accordance with this invention have a weight ratio of particulate inorganic powder to surfactant is in the range of from 500:1 to 1:1.
  • the invention concerns a fire extinguishing foam which comprises the aqueous composition in accordance with the present invention.
  • the aqueous composition according to the invention may be foamed using means known to the skilled person in the art in order to obtain the fire extinguishing foam according to the invention.
  • the method comprises the steps of providing a mixture of water and surfactant and/or a hydrotrope, providing a particulate inorganic material, selected from the group consisting of perlite, talc, calcium carbonate, dolomite, and bentonite, and combinations thereof, optionally providing one or more additives, mixing the provided mixture of water and surfactant and/or a hydrotrope, the provided particulate inorganic material and optionally the provided said one or more additives, and finally foaming the obtained mixture. It was found that good foam stability could be obtained using the method of formation in accordance with the present invention.
  • the method comprises the steps of providing a dry precursor of the present invention, providing water, optionally providing one or more additives, mixing the provided dry precursor, the provided water and optionally the provided one or more additives, and finally foaming the obtained mixture. It was found that good foam stability could be obtained using the method of formation in accordance with the present invention.
  • part of the present invention is the use of a particulate inorganic materials in an aqueous composition according to the invention, and by extension in a fire extinguishing foam according to the present invention.
  • the particulate inorganic materials for the said use is selected from the group consisting of perlite, talc, calcium carbonate, dolomite, and bentonite, and combinations thereof.
  • Also part of the present invention is a method of extinguishing a fire comprising the use of a particulate inorganic mineral in accordance with the present invention, or an aqueous composition in accordance with the present invention.
  • Fig. 1 graphically represents Examples 10 to 39 of the experimental section disclosed herein (see below), as well as the geographical origin of the various talc samples tested.
  • the present invention provides an aqueous composition for the formation of a foam, in particular a foam for use in fire extinguishing applications, in particular for class B fires.
  • Aqueous foams are already employed to extinguish class B fires.
  • the foams in accordance with the present invention avoid the need to use FC based formulations and are environmentally friendly, while at the same time use readily available components and improve fire extinguishing properties by increasing foam stability.
  • foams formed according to the present invention do not collapse as easily as state of the art foams, and maintain their foamy structure over a longer period of time. While in laboratory tests, state of the art foams were found to lose about 80% or more of their initial mass by water drainage within 10 minutes of formation, foams formed according to the present invention were found to maintain up to 90% of their initial mass after 60 minutes. These values were obtained by using the method as described in the Examples section of the present description.
  • the particulate inorganic materials remain at the water-air interface of the foam bubbles to improve the foam stability.
  • the ratio of surfactant to particulate inorganic material therefore needs to be balanced. When there is too much surfactant, it absorbs excessively onto the inorganic particulate material and causes it to move into the water phase, away from the interface.
  • the surfactant is above the critical micelle concentration for good foam formation.
  • the surfactants absorb onto the inorganic particulate materials in the aqueous composition.
  • Such surfactants are also known as collectors.
  • a cationic surfactant may adhere to a negatively charged surface of an inorganic particle, such as talc.
  • an aqueous composition for forming a fire extinguishing foam comprising a surfactant and/or a hydrotrope, a particulate inorganic material selected from the group consisting of perlite, talc, calcium carbonate, dolomite, and bentonite, and combinations thereof, and optionally one or more additives.
  • the surfactant comprises or is one or more anionic surfactants, or one or more cationic surfactants, or one or more non-ionic surfactants, or combinations thereof.
  • Suitable anionic surfactants include, but are not limited to, alkyl ether sulphates, such as sodium lauryl ether sulphate, and alkyl sulphates, such as sodium lauryl sulphate. Suitable anionic surfactants further include ammonium lauryl sulfate, ammonium laureth sulfate, triethylamine lauryl sulfate, triethylamine laureth sulfate, triethanolamine lauryl sulfate, triethanolamine laureth sulfate, monoethanolamine lauryl sulfate, monoethanolamine laureth sulfate, diethanolamine lauryl sulfate, diethanolamine laureth sulfate, lauric monoglyceride sodium sulfate, sodium lauryl sulfate, sodium laureth sulfate, potassium laureth sulfate, sodium lauryl sarcosinate, sodium lauroyl
  • the anionic surfactant may be, for example, an aliphatic sulfonate, such as a primary C 8 -C 22 alkane sulfonate, primary C 8 -C 22 alkane disulfonate, C 8 -C 22 alkene sulfonate, C 8 -C 22 hydroxyalkane sulfonate or alkyl glyceryl ether sulfonate.
  • an aliphatic sulfonate such as a primary C 8 -C 22 alkane sulfonate, primary C 8 -C 22 alkane disulfonate, C 8 -C 22 alkene sulfonate, C 8 -C 22 hydroxyalkane sulfonate or alkyl glyceryl ether sulfonate.
  • Suitable cationic surfactants include, but are not limited to, alkyl trimethyl ammonium halides, or dialkyl dimethyl ammonium halides, wherein the alkyl group may comprise from 8 to 24 carbon atoms, such as for example 10 or 12 or 14 or 16 or 18 or 20 or 22 carbon atoms, such as tetradecyltrimethylammonium bromide, or dicocodimethylammonium chloride.
  • Suitable cationic surfactants are quaternary ammonium species such as dihydrogenated tallowoylethyl hydroxyethylammonium methosulfate, or a polymeric quaternary ammonium esters as described in US 8,936,159 B2 , the contents of which are incorporated herein by reference. Without wanting to be bound by theory, it is thought that a cationic surfactant is likely to be acting more like a collector does in flotation systems. Thus, given the negative charge on the particle surfaces in near neutral pH conditions, a cationic surfactant is likely to more strongly adsorb onto the particles than the an anionic surfactant, which may still absorb on talc, but more likely via adsorption of its hydrophobic tail.
  • Suitable non-ionic surfactants include alcohols, acids, amides or alkyl phenols reacted with alkylene oxides, especially ethylene oxide either alone or with propylene oxide.
  • Exemplary non-ionics are C 6 -C 22 alkyl phenols-ethylene oxide condensates, the condensation products of C 8 -C 18 aliphatic primary or secondary linear or branched alcohols with ethylene oxide, and products made by condensation of ethylene oxide with the reaction products of propylene oxide and ethylenediamine.
  • Other non-ionics include long chain tertiary amine oxides.
  • Other non-ionics are surfactants based on cocoamide and produced by reacting cocoamide with an alcohol amine, such as ethanolamine.
  • non-ionics include cocoamide MEA and cocoamide DEA.
  • Other suitable non-ionics include alkyl polyglucosides such as decyl glucoside, lauryl glucoside and octyl glucoside.
  • the surfactant is a sodium lauryl sulphate (or sodium dodecyl sulfate, SDS), or a sodium lauryl ether sulphate (SLES).
  • the surfactant is tetradecyltrimethylammonium bromide (TTAB), or dicocodimethylammonium chloride.
  • the surfactant should be present in the aqueous composition according to one aspect of the present invention in an amount below or above the critical micelle concentration (CMC).
  • CMC is defined as the concentration of surfactants above which micelles form and all additional surfactants added to the system go to micelles. If there is too much surfactant present in the composition, it may move the particulate inorganic material into the aqueous phase, preventing it from exercising its foam stabilising properties. The ratio of surfactant to inorganic particulate material therefore needs to be balanced. State of the art compositions may require a ratio of surfactant to water of up to 5.0 wt.-%.
  • the ratio of surfactant to water in the composition according to the invention is in the range of 0.01 to 5 wt.-%.
  • the ratio of surfactant to water in the composition may be in the range of 0.05 to 4 wt.-%, such as for example 0.1 to 3 wt.-%, such as for example about 0.05 wt.-%, about 0.3 wt.-%, about 0.5 wt.-%, about 1 wt.-%, about 2 wt.-%, about 3 wt.-%, about 4 wt.-%, or about 5 wt.-%.
  • a ready to be foamed composition may have a ratio of surfactant to water from about 0.05 wt.-% to about 0.1 wt.-%.
  • a concentrate which requires dilution prior to foaming may have a ratio of surfactant to water from about 0.5 wt.-% to about 5 wt.-% or to about 1 wt.-%.
  • the stability of the foams formed from the inventive aqueous composition is improved by the presence of a particulate inorganic material.
  • particle size properties referred to herein for the inorganic particulate materials are as measured in a well-known manner by sedimentation of the particulate material in a fully dispersed condition in an aqueous medium using a Sedigraph 5100 machine as supplied by Micromeritics Instruments Corporation, Norcross, Georgia, USA (web-site: www.micromeritics.com ), referred to herein as a "Micromeritics Sedigraph 5100 unit".
  • a Sedigraph 5100 machine provides measurements and a plot of the cumulative percentage by weight of particles having a size, referred to in the art as the equivalent spherical diameter' (e.s.d), less than given e.s.d values.
  • the mean particle size d 50 is the value determined in this way of the particle e.s.d at which there are 50% by weight of the particles which have an equivalent spherical diameter less than that d 50 value.
  • the top cut particle size d 90 is the value determined in this way of the particle e.s.d at which there are 90% by weight of the particles which have an equivalent spherical diameter less than that d 90 value.
  • the particulate inorganic material shall have a particle size range that renders it suitable for foam formation, although the particle size range shall not be specifically limited.
  • the inorganic particulate material may have a mean particle size d 50 from about 0.01 ⁇ m to about 1 mm, provided that stable foams may be formed with such particulate material.
  • the particulate inorganic material may have a d 50 no greater than about 500 ⁇ m, for example no greater than about 250 ⁇ m, or no greater than about 100 ⁇ m, or no greater than about 50 ⁇ m.
  • the inorganic particulate material has a d 50 of no greater than about 25 ⁇ m, for example, no greater than about 10 ⁇ m, or no greater than about 5 ⁇ m, or no greater than about 1 ⁇ m. In certain embodiments, the inorganic particulate material has a d 50 of from about 0.05 ⁇ m to about 5 ⁇ m, for example, or from about 0.1 ⁇ m to about 2.5 ⁇ m, or from about 0.5 ⁇ m to about 1 ⁇ m.
  • the particulate inorganic material may have a d 90 no greater than about 1 mm, for example no greater than about 500 ⁇ m, or no greater than about 400 ⁇ m, or no greater than about 300 ⁇ m, or no greater than about 200 ⁇ m, or no greater than about 100 ⁇ m.
  • the inorganic particulate material has a d 90 of no greater than about 50 ⁇ m, for example, no greater than about 20 ⁇ m, or no greater than about 10 ⁇ m, or no greater than about 5 ⁇ m.
  • the inorganic particulate material has a d 90 of from about 0.5 ⁇ m to about 10 ⁇ m, for example, or from about 1 ⁇ m to about 7.5 ⁇ m, or from about 2.5 ⁇ m to about 5 ⁇ m.
  • the inorganic particulate material is selected from the group consisting of perlite, talc, calcium carbonate, kaolin, dolomite, and bentonite, and combinations thereof.
  • the inorganic particulate material is selected from the group consisting of talc, calcium carbonate, kaolin, and combinations thereof.
  • the inorganic particulate material is talc, such as a macrocrystalline talc, or a microcrystalline talc, or a combination thereof.
  • the individual platelet size i.e. the median diameter as measured by the Sedigraph method, of an individual talc platelet (a few thousand elementary sheets) can vary from approximately 1 ⁇ m to over 100 ⁇ m, depending on the conditions of formation of the deposit.
  • the individual platelet size determines the lamellarity of the talc. A highly lamellar talc will have large individual platelets, whereas a microcrystalline talc will have small platelets. Although all talcs may be termed lamellar, their platelet size differs from one deposit to another.
  • microcrystalline talc Small crystals provide a compact, dense ore, known as microcrystalline talc. Large crystals come in papery layers, known as macrocrystalline talc. Known microcrystalline talc deposits are located in Montana (Yellowstone) and in Australia (Three Springs). In a microcrystalline structure, talc elementary particles are composed of small plates compared to macrocrystalline structures, which are composed of larger plates.
  • the inorganic particulate material is a microcrystalline talc having a d 90 of about 50 ⁇ m or less, such as for example 30 ⁇ m or less, such as for example 20 ⁇ m or less, such as for example 10 ⁇ m or less, such as for example about 5 ⁇ m, and a d 50 of about 20 ⁇ m or less, such as for example 10 ⁇ m or less, such as for example 5 ⁇ m or less, such as for example 3 ⁇ m or less, such as for example about 3 ⁇ m or about 1 ⁇ m.
  • the amounts of surfactant and inorganic particulate material need to be balanced, in order to avoid that the inorganic particulate material is moved into the aqueous phase by the surfactant, away from the water-air interface of the foam bubbles, preventing it from developing its foam stabilising properties.
  • the ratio of particulate inorganic powder to water in the aqueous composition according to the present invention may be in the range of 1 to 60 wt.-%, such as for example in the range from 2 wt.-% to 50 wt.-%, or in the range from 3 wt.-% to 20 wt.-%, or in the range of 4 to 10 wt.-%, such as for example about 4 wt.-%, or about 5 wt.-%, or about 6 wt.-%, or about 8 wt.-%, or about 10 wt.-%, or about 12 wt.-%.
  • a ready to be foamed composition may have a ratio of particulate inorganic powder to water from about 1 wt.-% to about 6 wt.-% or to about 3 wt.-%.
  • a concentrate which requires dilution prior to foaming may have a ratio of surfactant to water from about 10 wt.-% to about 60 wt.-% or to about 30 wt.-%.
  • the ratio of particulate inorganic powder to surfactant in the aqueous composition according to the present invention may be in the range of 500:1 to 1:1, such as for example in the range of 300:1 to 2:1, or 250:1 to 5:1, or 200:1 to 10:1, or 100:1 to 50:1, such as for example about 200:1, or about 100:1, or about 50:1.
  • Viscosity increasing polymers are known to the skilled person in the art and may include gums, such as xanthan gums. These may also act as film formers and foam stabilisers.
  • Minerals based anti-settling agents are known to the skilled person in the art.
  • attapulgite (“Attagel 40", BASF), kaolin and/or sepiolite may be employed.
  • Glycol ethers may be employed as anti-freeze agents, foam boosters and solvents.
  • compositions in accordance with the present invention include corrosion inhibitors, anti-microbial additives, hardness ion sequestrants, pH buffers, and/or salts to control foaming with soft water, in order to allow the use of the compositions according to the present invention with fresh water, or sea water, as may be required.
  • the aqueous composition in accordance with the present invention comprises very little fluorinated compounds, such as for example less than 1 wt.-% fluorinated compounds, or less than 1.0 wt.-% fluorinated compounds, or less than 0.5 wt.-% fluorinated compounds, or less than 0.1 wt.-% fluorinated compounds, or less than 0.05 wt.-% fluorinated compounds, or less than 0.01 wt.-% fluorinated compounds, or less than 0.001 wt.-% fluorinated compounds, or no detectable fluorinated compounds.
  • fluorinated compounds such as for example less than 1 wt.-% fluorinated compounds, or less than 1.0 wt.-% fluorinated compounds, or less than 0.5 wt.-% fluorinated compounds, or less than 0.1 wt.-% fluorinated compounds, or less than 0.05 wt.-% fluorinated compounds, or less than 0.01
  • the dry precursor composition consists of a particulate inorganic material, selected from the group consisting of perlite, talc, calcium carbonate, dolomite, and bentonite, and combinations thereof, and a surfactant and/or hydrotrope.
  • the said particulate inorganic material and the said surfactant and/or hydrotrope are combined in such amounts that by mere addition of water, an aqueous composition in accordance with the present invention may be obtained.
  • the surfactant may comprise or consist of one or more anionic surfactants, or one or more cationic surfactants, or one or more non-ionic surfactants, or combinations thereof, as discussed above in the case of the aqueous compositions in accordance with the present invention.
  • the particulate inorganic material may be selected from the materials, particle size distributions, and quality as discussed above in the case of the aqueous compositions in accordance with the present invention.
  • the dry precursor composition further comprises one or more additives.
  • the aqueous compositions may be obtained by providing a dry precursor composition according to the invention, and by adding the required amount of water to obtain an aqueous composition in accordance with the invention.
  • the aqueous compositions may be obtained by mixing water and surfactant and/or hydrotrope in the required amounts, and by adding the particulate mineral material under stirring to obtain an aqueous composition in accordance with the invention.
  • the said particulate mineral material may be added in a dry state, or in a wet (aqueous) state, or as a suspension, such as for example an aqueous suspension.
  • aqueous compositions according to the present invention may be foamed in order to form a fire extinguishing foam, which also forms part of the present invention.
  • the aqueous compositions may be used for forming fire extinguishing foams.
  • the compositions may be present in various concentrations, depending on whether they are intended to be foamed as they are, or whether they may be diluted from using readily available water source.
  • concentrated compositions that may be diluted with sea water prior to foaming may be stored.
  • the compositions may be maintained at a lower concentration or a ready-to-use aqueous dilution. Therefore the aqueous compositions in accordance with the present invention may be provided as concentrates with low water content, or as dilute aqueous compositions with high water content. Accordingly, the content of particulate inorganic powder in the aqueous compositions may be the range of 1 wt.-% to 60 wt.-%, based on the total weight of the composition.
  • the aqueous compositions may be foamed using the methods known to the skilled person in the art, i.e. foaming by mechanical means. Such mechanical means may include foam nozzles or foam generators.
  • foaming by mechanical means.
  • Such mechanical means may include foam nozzles or foam generators.
  • inorganic particulate materials as discussed herein for the formation of fire extinguishing foams is part of the present invention.
  • the use of inorganic particulate materials leads to more stable foams which in use remain longer on the surface of a burning fuel in a class B fire, with a low decomposition rate, and low rate of mixing into the burning fuel.
  • the inorganic particulate materials present in the fire extinguishing composition remain in the system, because they are generally stable at the temperatures encountered in a class B fire, with no decomposition expected below 1000°C. Accordingly, the inorganic particulate materials may provide an insulating blanket that will also retain its foam structure even if the water in the foam has evaporated.
  • the inorganic particulate materials for use according to the present invention are readily available on the world market, and do not carry the risk of environmental pollution after use in a fire fighting foam.
  • the foams according to the present invention do not contain any fluorinated components and have a lower surfactant content than the foams of the state of the art.
  • compositions according to the present invention had satisfactory to excellent foaming properties.
  • Foam expansion ratios (FER) of close to 5 or more could be obtained with standard tap water, and even from 8 to over 20.
  • the present invention may comprise any combination of the features and/or limitations referred to herein, except for combinations of such features which are mutually exclusive.
  • the foregoing description is directed to particular embodiments of the present invention for the purpose of illustrating it. It will be apparent, however, to one skilled in the art, that many modifications and variations to the embodiments described herein are possible. All such modifications and variations are intended to be within the scope of the present invention, as defined in the appended claims.
  • a number of inorganic particulate materials (10 wt.-%) were mixed into a 0.3 wt.-% foamed solution of sodium lauryl ether sulphate (MEYCO SLF 30, provided by BASF) in water, and the resulting compositions mixed using a laboratory foam generator.
  • the resulting foams (60 g) were filled into a funnel cell with a frit sufficiently coarse such that the mineral particles do not block water drainage from the foam thereby affecting the results, and a collector at the bottom, and left to stand. Any foam decomposition was measured by measuring the amount of water collected underneath the funnel cell.
  • Example 4 the stability after 60 minutes was 91%.
  • the talc used in Example 4 is a microcrystalline talc having a d 90 of 5 ⁇ m and a d 50 of 1 ⁇ m.
  • the talc used in Example 5 is a macrocrystalline talc having a d 95 of 6.2 ⁇ m and a d 50 of 1.8 ⁇ m (by Sedigraph - ISO 13317-3).
  • Foams were tested in the presence of various amounts of talc and tetradecyltrimethylammonium bromide (TTAB), using either demineralised water (Example 8) or standard tap water (Example 9).
  • the talc used was a microcrystalline talc provided by Imerys Talc having a BET surface area of 21 m 2 /g (ISO 9277) and a median particle size of 1.1 ⁇ m (by Sedigraph - ISO 13317-3).
  • TTAB was used as a 5% aqueous stock solution.
  • the foams were prepared by combining talc and TTAB stock solution and making up to 100 g using demineralised or tap water. The resulting compositions mixed using a laboratory foam generator.
  • the talc used in Examples 10 to 12 was a microcrystalline talc provided by Imerys Talc having a BET surface area of 21 m 2 /g (ISO 9277) and a median particle size of 1.1 ⁇ m (by Sedigraph - ISO 13317-3).
  • the talc used in Examples 13 to 15 was a microcrystalline talc having a median particle size of 0.5 ⁇ m (by Sedigraph - ISO 13317-3).
  • the talc used in Examples 16 and 17 was a synthetic talc as explained below.
  • the foams were prepared by diluting 3 wt.-% stock solutions of various surfactants in water to obtain dilute solutions of surfactant in water, followed by addition of the talc and making up to 100 g using tap water.
  • the resulting compositions were mixed using a laboratory foam generator.
  • the resulting foams were filled into a funnel cell with a coarse frit and collector at the bottom, and left to stand. Any foam decomposition was measured by measuring the amount of water collected underneath the funnel cell.
  • the varying test parameters are shown in Table VII.
  • the said synthetic talc was obtained in accordance with the methods including solvothermal treatment at a pressure greater than 1 MPa and at temperatures from 100°C to 600°C, as disclosed in WO 2015/159006 (continuous process) or WO 2008/009799 (batch process).
  • the synthetic talc thus obtained was characterised by X-ray diffraction analysis, wherein the diffraction pattern showed a peak located at a distance of the order of 9.40 to 9.68 ⁇ , for a plane (001), a peak located at 4.50 to 4.75 ⁇ , for a plane (020), a peak located at 3.10 to 3.20 ⁇ , for a plane (003), and a peak located at 1.50 to 1.55 ⁇ , for a plane (060).
  • the synthetic talc has a d 50 median particle size of 500 nm and a BET surface area in the range of 300 to 500 m 2 /g.
  • Table VII Example Parameters Ex. 10 0.05 wt.-% SLS, 5 wt.-% talc Ex. 11 0.05 wt.-% SLES, 5 wt.-% talc Ex. 12 0.05 wt.-% Arquad C-35, 5 wt.-% talc Ex. 13 0.05 wt.-% SLS, 5 wt.-% talc Ex. 14 0.05 wt.-% SLES, 5 wt.-% talc Ex.
  • Foams were tested in the presence of various amounts of talc which had been wetted with a 15 wt.-% surfactant in water solution, using standard tap water.
  • the talc used in Examples 18 to 23 was a microcrystalline talc provided by Imerys Talc having a BET surface area of 21 m 2 /g (ISO 9277) and a median particle size of 1.1 ⁇ m (by Sedigraph - ISO 13317-3), which had been made up as a wet talc composition comprising talc and 15 wt.-% surfactant-in-water. Water was added gradually while mixing to obtain the aqueous solution which was subsequently foamed. Foam stability was tested in the same way as for Examples 10 to 17 (see above).
  • Table IX Example Parameters Ex. 18 0.025 wt.-% SLS, 5 wt.-% talc Ex. 19 0.05 wt.-% SLS, 5 wt.-% talc Ex. 20 0.10 wt.-% SLS, 5 wt.-% talc Ex. 21 0.025 wt.-% SLS, 5 wt.-% talc Ex. 22 0.05 wt.-% SLS, 5 wt.-% talc Ex. 23 0.10 wt.-% SLS, 5 wt.-% talc
  • Example 18 the compositions were foamed immediately after formation. In Examples 21 to 23, the compositions were foamed 7 days after formation. Table X: Time (min) 0 5 10 15 30 FER Ex. 18 100 100 90 82 69 17.4 Ex. 19 100 100 99 95 87 15.7 Ex. 20 100 95 90 87 83 6.5 Ex. 21 100 100 90 80 65 20.6 Ex. 22 100 100 98 95 86 15.7 Ex. 23 100 95 91 87 83 8.0
  • Foams were tested in the presence of various amounts of talc which had not been wetted prior to use and prior to being mixed with surfactants, using standard tap water.
  • the talc used in Examples 24 to 25 was a microcrystalline talc provided by Imerys Talc having a BET surface area of 21 m 2 /g (ISO 9277) and a median particle size of 1.1 ⁇ m (by Sedigraph - ISO 13317-3), which had been mixed with SLS in a 100:1 weight ratio (5 g talc and 0.05 g SLS), prior to addition of water.
  • Example 24 the composition were foamed immediately after formation.
  • Example 25 the composition was foamed 14 days after formation. The results are shown in Table XI.
  • Foams were tested in the presence of equal amounts of various microcrystalline and macrocrystalline talcs and tetradecyltrimethylammonium bromide (TTAB), using standard tap water.
  • the foams were prepared and tested in the same way as in the previous examples.
  • the results are shown in Table XII.
  • the median particle sizes d 50 as measured by Sedigraph (ISO 13317-3), are indicated.
  • the foam stability is indicated by the time required to drain 30% of the water from the foam.
  • Table XII Ex. d 50 ( ⁇ m) time (min) Ex. d 50 ( ⁇ m) time (min) Ex.
  • Fig. 1 also represents the geographical origin of the various talcs. While the graph indicates that there is some influence on foam stability from the talc's origin, the biggest effect is particle size; the finer the talc, the more stable is the foam.

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EP18305472.5A 2018-04-17 2018-04-17 Brandunterdrückende schaumbildende zusammensetzungen, vorläufer, deren verwendungen und verfahren zur herstellung davon Withdrawn EP3556441A1 (de)

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CN201980026229.3A CN111989139A (zh) 2018-04-17 2019-04-17 灭火泡沫形成用组合物、前体、其用途及其制备方法
BR112020021041-2A BR112020021041A2 (pt) 2018-04-17 2019-04-17 Composições formadoras de espumas supressoras de incêndio, precursores, seus usos e métodos de prepará-las
PCT/EP2019/060016 WO2019202045A1 (en) 2018-04-17 2019-04-17 Fire suppressant foam forming compositions, precursors, their uses and methods of making them
KR1020207032786A KR20200141503A (ko) 2018-04-17 2019-04-17 화재 진압제 포움 형성 조성물, 전구체, 이들의 용도 및 이들의 제조 방법
US17/048,265 US20210101040A1 (en) 2018-04-17 2019-04-17 Fire suppressant foam forming compositions, precursors, their uses and methods of making them
EP19719472.3A EP3781271A1 (de) 2018-04-17 2019-04-17 Brandunterdrückende schaumbildende zusammensetzungen, vorläufer, deren verwendungen und verfahren zur herstellung davon
JP2020556948A JP2021520941A (ja) 2018-04-17 2019-04-17 火災抑制泡沫を形成する組成物、前駆体、それらの使用およびそれらを製造する方法

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US11673010B2 (en) 2021-05-14 2023-06-13 Tyco Fire Products Lp Fire-fighting foam concentrate
EP4337344A1 (de) 2021-05-14 2024-03-20 Tyco Fire Products LP Feuerlöschschaumzusammensetzung
US11673011B2 (en) 2021-05-14 2023-06-13 Tyco Fire Products Lp Firefighting foam composition
US11497952B1 (en) 2021-05-14 2022-11-15 Tyco Fire Products Lp Fire-fighting foam concentrate
US11666791B2 (en) 2021-05-14 2023-06-06 Tyco Fire Products Lp Fire-fighting foam composition
WO2023144683A1 (en) * 2022-01-27 2023-08-03 Tyco Fire Products Lp Firefighting foam composition
WO2024028668A1 (en) * 2023-06-27 2024-02-08 Mahmoud Torabinejad Fire retardant coating material
KR102664166B1 (ko) * 2023-08-31 2024-05-08 김종삼 리튬이온배터리 화재 진압용 강화액 소화약제

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CN111989139A (zh) 2020-11-24
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